I checked the script related npc's.
It seems that there isn't much you can buy with red scrip.
The red scrip gear has fewer stats than HQ ilevel 170 gear.
Moreover, each one of the offhand tools costs 26 red Rowena's Token.
That's 3 weeks.

Tier 4 Materia's are much cheaper to buy than crafting 50 red scrips.

Is red scrip's only use to upgrade ilevel 180 blue scrip gear to ilevel 200 red scrip gear?